The Yeastar S-Series VoIP PBX is a modular, future-proof phone system designed for small and medium businesses to improve efficiency and cut costs. It supports SIP/IAX2, PSTN, ISDN BRI, E1/T1/PRI, and 3G/4G, offering fast installation, auto-provisioning, and an intuitive Metro UI. With built-in call recording, advanced failover, firewall, TLS/SRTP encryption, and remote management, it ensures strong reliability and security. Add-ons like Linkus UC clients, LDAP, VPN server, billing, and hotel apps expand functionality. Supporting up to 50 users and 25 concurrent calls, it integrates with CRMs and call centers, connecting sites seamlessly without hidden licensing fees.

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